My warmer does not appear to heat up

The warmers are very low power and designed with your pet's safety first. It will at most only feel slightly warmer than your own body temperature. It will feel warmer where your pet is lying on it. If left out in the open it will not feel warm at all as the small amount of heat it produces quickly dissipates in the to surrounding air. Similarly the areas that are not covered with a pet will also stay cool to the touch. Our test is to roll a towel up and cover the warmer while it is installed in the bed and let is run for at least 10 minutes. If should feel warm under the towel. If not then something is wrong.